.mask {
  background: rgb(0 0 0 / 55%);
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10000;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  touch-action: none;
  transition: opacity 0.2s;
  animation: fadeIn 0.2s linear;
}

@keyframes fadeIn {
  0% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}
